﻿function getNavigatorVersion(){
    var Sys = {};
    var ua = navigator.userAgent.toLowerCase();
    var s;
    (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
    (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
    (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
    (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
    (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;

    //以下进行测试
    if (Sys.ie) return 0;
    if (Sys.firefox) return 1;
    if (Sys.chrome) return 2;
    if (Sys.opera) return 3;
    if (Sys.safari) return 4;
}

function switchMenu(oSpan){            
    var oUl = null;
    var oImg = null;
    var oDiv = null;
    oDiv = oSpan.parentNode;

    switch(getNavigatorVersion()){
    case 0:                                        
        oUl = oDiv.lastChild;
        break;
    case 1:                
        oUl = oDiv.childNodes[3];
        break;
    }
    if (oUl.style.display == "none"){
        oUl.style.display = "block";
    }else{    
        oUl.style.display = "none";  
    }
}